Statistics for occurrence #1 of “O. Similarly” in chapter 22 of John D. Billings, Hardtack and Coffee: The Unwritten Story of Army Life:

... the symbols 2 and 1. Let us suppose the flagman to make the signal for 1, and follow it immediately with the motion for 2. This would naturally be read as 12, which the code showed to mean O. Similarly , two consecutive waves to the right, or 22, represented the letter N. Three waves to the right and one to the left, or 2221, stood for the syllable tion. So by repeating the symbols and changing the ...
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O. Similarly 2 2 0 0 0 user votes

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